How much does spray foam insulation cost?

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Curious about the cost of spray foam insulation in the UK in 2024? The average spray foam insulation cost is £2,000 to £6,000 for a typical home. Our comprehensive guide provides insights into what you can expect to pay.

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Understanding how much spray foam insulation costs is important if you are looking to enhance your property's energy efficiency. This insulation method offers a high-performance solution, significantly reducing heating and cooling expenses. However, the complexity of installation means it's often best handled by professionals. Their expertise ensures the insulation is applied correctly, maximising its effectiveness and durability. Investing in professional installation can also help you avoid potential issues, making it a wise choice for long-term savings.

We'll cover the following topics in this pricing guide:
  1. Average spray foam insulation costs
  2. How long does spray foam insulation take to install?
  3. How to reduce spray foam insulation costs
  4. FAQ
  5. Your spray foam insulation checklist

Average spray foam insulation costs

Spray foam insulation is a popular choice if you are seeking to improve your home's thermal efficiency. The cost varies depending on the type of spray foam, the area to be insulated, and the complexity of the job. In the following table you find a breakdown of the core costs:

Spray foam insulation jobsPrice range
Roof insulation£20–£35 per m²
Wall insulation£25–£40 per m²
Floor insulation£30–£45 per m²
Loft insulation£25–£40 per m²

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Open-cell foam versus closed-cell foam

The cost of spray foam insulation varies by type and application. Open-cell foam is generally cheaper but less dense, making it ideal for sound insulation and less useful for heat retention (lower R-value). Closed-cell foam, while more expensive, offers superior thermal insulation (higher R-value) and structural support. Time frames for installation can range from a few hours to several days, depending on the project size and complexity you’re planning.

Pros and cons

  • Both open-cell foam and closed-cell foam have their pros and cons. These are, in short:
  • Open-cell: less expensive, good for soundproofing, but lower R-value.
  • Closed-cell: higher R-value, moisture barrier, but more costly.

Additional costs

You may expect additional costs, such as:

Electrical work: £150–£400

Removal work: £200–£600

Decorating: £100–£300

Factors influencing costs include property size, foam type, and accessibility. Labour typically accounts for a significant portion of the expense, alongside materials and any required prep work.

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How long does spray foam insulation take to install?

The time it takes to install spray foam insulation in your home can vary significantly based on several factors, including the size of the area being insulated, the type of spray foam (open-cell or closed-cell), and the specific requirements of your property. Generally, most residential spray foam insulation projects are completed within 1 to 2 days. However, depending on your project's complexity and the preparation required before the application, installation could take longer. For example if it involves large or complex areas, extensive preparation work, or properties with hard-to-reach spaces requiring special equipment.

Before the insulation process begins, a professional installer will conduct an initial assessment of your property to determine the best insulation strategy and the amount of material needed. This stage is crucial for planning the work and ensuring all necessary preparations are in place. Following this, the application of the spray foam takes place, which is relatively quick but requires precision and expertise.

After the insulation is applied, it needs some time to expand and cure properly. While this doesn't necessarily extend your installation time (as it happens post-application), it's a critical part of the process that affects when the area will be ready for you to use again. Finally, a thorough cleanup and a final inspection are conducted to ensure the quality and effectiveness of the insulation.

Here's a breakdown of the estimated time required for each phase of your spray foam insulation process:

Initial assessment1–2 hours
Preparation2–4 hours
Insulation application3–8 hours (depending on area size)
Curing & drying24 hours
Final inspection & cleanup1–2 hours

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How to reduce spray foam insulation costs

In order to reduce the expenses for spray foam insulation, we recommend you to do the following:

  • Compare quotes: Obtain multiple estimates to ensure competitive pricing.
  • Opt for partial DIY: Handle prep work yourself to reduce labour costs, such as clearing the area of debris and dust, removing old insulation material, and ensuring the space is well-ventilated.
  • Bulk discounts: Larger jobs may qualify for discounted rates on materials.
  • Government grants: Explore available energy efficiency grants to offset costs, such as Green Homes Grant, Local Authority Delivery Scheme (LAD) and Renewable Heat Incentive (RHI). However, check whether they are still applicable for you.


Find all the answers you need with our FAQ on spray foam insulation:

Can I install spray foam insulation myself?

DIY spray foam insulation is not recommended due to the complex nature of the application process and the potential for incorrect installation. Professional installation ensures the foam expands and adheres correctly, avoiding gaps and ensuring maximum insulation efficiency. Additionally, professionals are equipped with safety gear and training to handle the chemicals involved, minimising health risks.

Spray foam kits available for your DIY project often lack the quality and coverage of professional-grade materials, leading to suboptimal insulation performance. For these reasons, some preparatory work can be done by you. For example clearing the area of debris and dust, removing old insulation material, and ensuring the space is well-ventilated. We recommend you 
to leave the application of spray foam insulation to the experts.

Is spray foam insulation worth the cost?

Spray foam insulation is a significant investment upfront but offers considerable long-term savings on energy bills due to its superior thermal performance. Its ability to create an air-tight seal reduces the workload on heating and cooling systems, leading to lower energy consumption for you.

Unlike traditional insulation materials, spray foam does not settle or degrade over time, maintaining its insulation properties for decades. Furthermore, it contributes to a healthier indoor environment by reducing the ingress of allergens and pollutants. Considering these benefits, spray foam insulation is worth the cost for you if you are looking for an effective, durable insulation solution.

How long does spray foam insulation last?

Spray foam insulation is renowned for its durability and longevity, often lasting the lifetime of your property. Its unique chemical composition ensures that it does not sag, settle, or degrade over time like other insulation materials, such as fibreglass, cellulose, mineral wool and polystyrene isolation. This permanence eliminates the need for replacement or upgrades, providing continuous energy efficiency and cost savings.

Additionally, spray foam is resistant to water and mould, further extending its life by preventing common causes of deterioration. The enduring nature of spray foam insulation makes it an excellent investment for you if you are seeking a long-term solution to energy loss and inefficiency.

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Your spray foam insulation checklist

Follow the following tips to make sure you get the most out of your spray foam insulation installation.

  • Research qualified installers: Ensure they have experience with spray foam.
  • Check references and reviews: Previous customer feedback can guide your choice.
  • Get detailed quotes: Understand what's included to avoid unexpected costs.
  • Confirm insurance: Protect against any potential damages during installation.

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